向下的臭氧净通量主极大值出现在1977、1990年和1998年，极小值在1993年和1996年。

The downward ozone flux maximums appear in 1977, 1990 and 1998, the minimums in 1993 and 1996, respectively.

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并使用LW法和GH法研究了轴上光强不为零但光强主极大在轴外的情况，通过定量计算对这两种方法进行了比较。

For the case that on-axis' intensity exists but the maximum intensity is not located on axis, both the LW method and GH method can be used. The two methods are compared by numerical calculations.

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